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 Post subject: Spark Plug Help - Twin Plug Heads
PostPosted: Sat Jan 13, 2018 12:24 pm 
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Joined: Sun Nov 10, 2013 8:44 pm
Posts: 4
Couldn't find any previous thread but may have been user error. I purchased a reversed head from Jan at Redfox and sent front head to be converted to twin plug and be ported and gas flowed. What I don't have is any idea of what spark plugs to run. I am running 900ie cams and the bike is a track only and carbs choice is still under discussion with with my very talented engine builder. I asked Jan for suggestions but received no response.

Any suggestions appreciated.


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 Post subject: Re: Spark Plug Help - Twin Plug Heads
PostPosted: Sat Jan 13, 2018 1:36 pm 
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Joined: Sat Oct 29, 2011 3:38 pm
Posts: 425
What diameter is the plug hole?


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 Post subject: Re: Spark Plug Help - Twin Plug Heads
PostPosted: Sun Jan 14, 2018 1:17 am 
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Joined: Thu Oct 14, 2010 11:23 am
Posts: 1151
You did not mention compression ratio, or pistons, or what carbs you are using, or any change in the ignition system you will use.

But, usually, with dual plugs you can expect to retard the ignition by 4 or more degrees from stock, and run leaner jetting (than before).

Why not just keep it simple, start with stock plugs, and see how it goes? D8EA ngks, or RA6HC champions work on my 750 and 900 engines. Both have big carbs, race cams, high compression pistons, and stock igntions.

MikeV


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